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INFANT JESUS ANGLO INDIAN HIGHER SECONDARY SCHOOL, Tangasseri KOLLAM. STD: X. SECOND MODEL EXAMINATION, January 2016. Time: 2hrs BIOLOGY Marks: 80. Attempt all questions from Section A and any four questions four questions from Section B. The intended marks for the questions or parts of questions are given in brackets [ ]. Section A (40 marks) Attempt all questions from this section Question 1 a) Name the following: [5] 1. One combined vaccine given to babies to build immunity against three common diseases. 2. The structure formed after the release of ovum from Graafian follicle. 3. A plant having sunken stomata. 4. The ear ossicle attached to the oval window of the inner ear. 5. The blood plasma from which the protein fibrinogen has been removed. b) Complete the following statements: [5] 1. ______ is the scientific name of the garden pea plant which Mendel used for his experiments. 2. The disease caused in children due to under secretion of thyroxine is ______. 3. The surgical method of sterilization in males is known as ______. 4. Raisins swell up when kept in a ______ solution. 5. The element required for the clotting of blood is ______. c) Choose the correct answer from each of the four options given below: 1. After mitotic cell division, a human female cell will have: (A) 44 + XX chromosome. (B) 44 + XY chromosome. (C) 22 + X chromosome. (D) 22 + Y chromosome. 2. The antibiotic penicillin is obtained from: (A) Protozoan. (B) Bacteria. (C) Virus. [5] (D) Fungus. 3. The dorsal root ganglion of the spinal cord contains cell bodies of the: (A) Motor neuron. (B) Sensory neuron. (C) Intermediate neuron. (D) Association neuron. 4. The part of the nephron which lies in the renal medulla is: (A) Glomerulus. (B) Proximal convoluted tubule. (C) Loop of Henle. (D) Distal convoluted tubule. 5. A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis is to: (A) Remove starch from the plant. (B) Ensure that the starch is not translocated from the leaves. (C) Remove chlorophyll from the leaf of the plant. (D) Remove starch from the experiment leaf. d) Mention, if the following statements are true or false. If false, rewrite the wrong statements to its correct form by changing the first word or the last word only: [5] 1. Colour blindness is a Y linked inheritance. 2. Plasmolysis makes the cell turgid. 3. Deafness is caused due to the rupturing of the pinna. 4. Dettol is an antiseptic. 5. Fertilization of the ovum takes place in the vagina. e) State the exact location of each of the following structures: 1. Spleen. 2. Pancreas. 4. Organ of Corti. 5. Hydathodes. [5] 3. Seminal vesicle. f) State the main function of each of the following: 1. Eustachian tube. 2. Chordae tendinae. 4. Guard cells. 5. Centromere. [5] 3. Placenta. g) Given below are five groups of terms. In each group arrange and rewrite the terms in the correct order so as to be in a logical sequence as directed at the end of each statements: [5] 1. Karyokinesis, S-phase, Cytokinesis, G2-phase, G1-phase. [Cell cycle] 2. Motor neuron, Receptor, Sensory neuron, Effector, Association neuron. [Pathway of nerve impulse] 3. Destarched plant, iodine added, washed in water, a leaf boiled in alcohol, placed in sunlight. [Testing the presence of starch] 4. Luteal phase, Follicular phase, Menstrual phase, Ovulatory phase. [Phases of menstrual cycle] 5. Posterior vena cava, Renal artery, Aorta, Renal vein, Kidney. [Pathway of blood] h) Given alongside is a diagram representing a stage during mitotic cell division in an animal cell: [5] 1. Identify the stage. Give a reason to support your answer. 2. Name the cell organelle that forms asters. 3. Name the parts labelled 1, 2 and 3. 4. Name the stage that follows this stage of mitosis. How can this stage be identified. 5. Mention the difference between mitosis and meiosis with regard to: (i) The number of daughter cells formed. (ii) The chromosome number in daughter cells. Section B (40 marks) Attempt any four questions from this section Question 2 a) Given below is the diagram of an experiment set up to study the process of transpiration in plants. Study the same and then answer the questions that follow: [5] 1. What is the colour of dry cobalt chloride paper? 2. Is the experiment leaf a monocot or a dicot leaf. Give a reason to support your answer. 3. Why are the glass slides placed over the dry cobalt chloride papers? 4. After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal sides and ventral sides of the leaf. Give a reason to support your answer. 5. Define the term transpiration. b) The diagram given below represents a certain category of blood vessels showing the role of a special structure in their walls: [5] 1. Name the kind of blood vessels shown. 2. What is the structure shown inside the blood vessels? 3. What is the role of these structures? 4. Are these structures present in any other kind of blood vessel. If so, name it. 5. Towards which side of the figure (Top or Bottom) is the heart located. Question 3 a) Given alongside are the diagrammatic sketches of some endocrine glands. Observe the figures and answer the following questions: [5] 1. Name the gland. 2. Label the parts numbered 1 to 4. 3. Name the part that joins the two lobes of the gland shown. 4. Name the hormones secreted by the gland. 5. Which chemicals in our body are greatly affected by hormone? 6. What is the chemical nature of the hormones? 7. Name the mineral that controls the secretion of these hormones.
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